[英]Double-click a JTree node and get its name
如何雙擊JTree節點並獲取其名稱?
如果我調用evt.getSource()
,似乎返回的對象是JTree。 我無法將其強制轉換為DefaultMutableTreeNode。
如果您有興趣檢測雙擊事件或用戶單擊節點時,無論是否選擇了該節點,我們建議您執行以下操作:
final JTree tree = ...;
MouseListener ml = new MouseAdapter() {
public void mousePressed(MouseEvent e) {
int selRow = tree.getRowForLocation(e.getX(), e.getY());
TreePath selPath = tree.getPathForLocation(e.getX(), e.getY());
if(selRow != -1) {
if(e.getClickCount() == 1) {
mySingleClick(selRow, selPath);
}
else if(e.getClickCount() == 2) {
myDoubleClick(selRow, selPath);
}
}
}
};
tree.addMouseListener(ml);
要從TreePath
獲取節點,您可以遍歷路徑,或者簡單地使用TreePath#getLastPathComponent
。
這將返回一個Object
,因此您需要自己回退到所需的節點類型。
以下代碼對我有用。
tree.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 2) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode)
tree.getLastSelectedPathComponent();
if (node == null) return;
Object nodeInfo = node.getUserObject();
// Cast nodeInfo to your object and do whatever you want
}
}
});
MadProgrammer涵蓋了幾乎所有內容。 要獲取對象,您可以調用
DefaultMutableTreeNode selectedNode =
((DefaultMutableTreeNode)selPath.getLastPathComponent()).
getUserObject();
我的例子。 我們可以檢測到雙擊延遲。
public class TreeListener extends MouseAdapter{
private JTree _Tree;
private boolean singleClick = true;
private int doubleClickDelay = 300;
private Timer timer;
public TreeListener(JTree tree)
{
this._Tree = tree;
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
timer.stop();
if (singleClick) {
singleClickHandler(e);
} else {
try {
doubleClickHandler(e);
} catch (ParseException ex) {
Logger.getLogger(ex.getMessage());
}
}
}
};
timer = new javax.swing.Timer(doubleClickDelay, actionListener);
timer.setRepeats(false);
}
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 1) {
singleClick = true;
timer.start();
} else {
singleClick = false;
}
}
private void singleClickHandler(ActionEvent e) {
System.out.println("-- single click --");
}
private void doubleClickHandler(ActionEvent e) throws ParseException {
System.out.println("-- double click -- id=");
}
}
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